X-ray tube cooling device

Abstract

The invention relates to the technical field of X-ray tube manufacturing, in particular to an X-ray tube cooling device. Comprising an X-ray tube, the X-ray tube comprises a tube shell, an anode assembly and a cathode assembly are arranged in the tube shell, the anode assembly comprises an anode target disc rotating around the x axis, and the anode assembly and the cathode assembly are arranged in the axial direction of the x axis at intervals; the pipe sleeve is arranged outside the pipe shell in a covering mode, and a cooling agent circulates in a cavity between the pipe sleeve and the pipe shell; a main liquid inlet is formed in the pipe sleeve, and is formed in one side, corresponding to the anode assembly, of the cavity; and the fluid director is arranged in the cavity, the fluid director comprises a fluid director flow channel, the fluid director flow channel is provided with a fluid director liquid inlet and a fluid director liquid outlet, the fluid director liquid inlet is adjacent to the tube shell corresponding to one side of the cathode assembly, and the fluid director liquid outlet is used for discharging the coolant in the cavity. The cooling efficiency of the X-ray tube can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of X-ray tube manufacturing, and in particular to an X-ray tube cooling device. Background Art

[0002] The medical X-ray diagnostic equipment, computer tomography (CT), uses an X-ray tube assembly for X-ray photography. The X-ray tube assembly includes a tube housing and an X-ray tube. The X-ray tube is housed in the tube housing and radiates X-rays. The tube housing is provided with an X-ray radiation window for X-rays to pass through, and lead plates for shielding X-rays are adhered to other parts of the inner wall of the tube housing.

[0003] The X-ray tube includes a cathode, an anode target and a vacuum shell. The cathode is opposite to the anode target and is offset relative to the rotation axis of the anode. In the vacuum environment formed by the vacuum shell, when a high voltage is applied between the cathode and the anode target, the cathode emits electrons, which are accelerated to the anode and collide with the target surface. The anode target radiates X-rays and is emitted through the window on the shell.

[0004] When a collision occurs, only about 1% of the electron energy can be converted into X-ray energy, and the rest is converted into heat energy. Therefore, it is very important to control the heat dissipation of the components inside the X-ray tube to prevent overheating from affecting the performance of the X-ray tube. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides an X-ray tube cooling device, which can improve the cooling efficiency of the X-ray tube.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: An X-ray tube cooling device, comprising: An X-ray tube, the X-ray tube comprises a tube shell, an anode assembly and a cathode assembly are arranged in the tube shell, the anode assembly comprises an anode target plate rotating around the x-axis, and the anode assembly and the cathode assembly are spaced apart in the axial direction of the x-axis; A pipe sleeve is arranged outside the pipe shell, and a coolant flows in a cavity between the pipe sleeve and the pipe shell; The tube sleeve is provided with a main liquid inlet, which is arranged on one side of the chamber corresponding to the anode assembly; The guide is arranged in the chamber, and the guide includes a guide channel, and the guide channel is provided with a guide liquid inlet and a guide liquid outlet. The guide liquid inlet is adjacent to the tube shell on one side of the corresponding cathode assembly, and the guide liquid outlet is used to discharge the coolant in the chamber.

[0007] Furthermore, in the present application, an X-ray tube cooling device, the tube shell includes an annular cover and an anode mounting shell and a cathode mounting shell arranged on both axial sides of the annular cover, the anode assembly is installed in the anode mounting shell, the cathode assembly is installed in the cathode mounting shell, the anode assembly includes an anode target disk, and the anode target disk is arranged in the annular cover; the chamber includes an anode chamber and a cathode chamber, the anode chamber and the cathode chamber respectively correspond to the spaces where the chambers are located at both ends of the annular cover in the x-axis direction, the anode mounting shell and the cathode mounting shell are respectively arranged in the anode chamber and the cathode chamber; the main liquid inlet is arranged in the anode chamber, and the diversion liquid inlet is arranged in the cathode chamber.

[0008] Furthermore, in an X-ray tube cooling device in the present application, the cathode mounting shell includes an insulating head and a cathode shell, the cathode shell is connected to the annular cover, the insulating head is connected to the cathode shell at one end away from the annular cover, the diversion liquid inlet includes a first liquid inlet adjacent to the cathode shell, and a heat-absorbing coating is attached to the inner surface of the cathode shell; a cooling cavity is provided on the insulating head, the cooling cavity is connected to the diversion flow channel, the diversion liquid inlet includes a second liquid inlet, and the second liquid inlet is arranged between the cooling cavity and the diversion flow channel.

[0009] Furthermore, in an X-ray tube cooling device in the present application, the cooling cavity is open at one end away from the annular cover; It also includes a cover, which is arranged at the open end of the cooling cavity, and the second liquid inlet is arranged on the cover. As a preferred solution of the present application, based on the above structure, the cooling cavity is arranged in the separately connected insulating head and the cover, which has the advantage of simple processing and manufacturing.

[0010] Furthermore, in an X-ray tube cooling device in the present application, a liquid inlet channel is provided on the cooling chamber, and the liquid inlet channel is arranged between the cover and the insulating head. As a preferred solution of the present application, a liquid inlet channel is provided to form convection with the channel opening, which can improve the fluidity of the coolant in the cooling chamber to improve the cooling efficiency.

[0011] Furthermore, in an X-ray tube cooling device in the present application, the cover includes an annular member, the annular member includes a tube body, the tube body extends axially into the cooling cavity, a gap is provided between the front end of the tube body in the extension direction and the bottom of the cooling cavity, the liquid inlet flow channel includes an inner extension flow channel, the inner extension flow channel is arranged between the inner side wall of the cooling cavity and the radial direction of the tube body; the flow channel opening is arranged on the inner side of the tube cavity of the tube body, and the flow channel opening is arranged at one end of the tube body away from the bottom of the cooling cavity. As a preferred embodiment of the present application, the provision of the inner extension flow channel can ensure that the coolant entering the cooling cavity is in full contact with the inner wall of the insulating head, so as to further improve the heat exchange efficiency.

[0012] Furthermore, in an X-ray tube cooling device in the present application, the annular member also includes an extension sleeve, the extension sleeve is arranged at one end of the tube body away from the bottom of the cooling cavity, the extension sleeve includes an annular wall, the annular wall is arranged radially outside the tube body, the extension sleeve also includes an annular top connected between the annular wall and the radial direction of the tube body, the end of the insulating head is arranged in the annular cavity between the extension sleeve and the tube body, and the liquid inlet flow channel includes an outer extension flow channel arranged between the extension sleeve and the side wall of the insulating head, and the outer extension flow channel connects the inner extension flow channel and the cavity. As a preferred embodiment of the present application, the coolant passes through the outer extension flow channel, the inner extension flow channel, the inner cavity of the tube body, and the flow channel opening to fully take away the heat of the insulating head.

[0013] Furthermore, in an X-ray tube cooling device in the present application, the cover also includes an end cover, the end cover is arranged on the open end of the ring member away from the bottom of the cooling chamber, the end cover and the ring member are sealed and connected, and the flow channel is arranged on the end cover. As a preferred embodiment of the present application, further, in an X-ray tube cooling device in the present application, a conductive needle is fixed on the insulating head, the conductive needle is axially inserted through the insulating head and the end cover, the end cover is fixed on the conductive needle, and the conductive needle and the end cover are sealed and connected. As a preferred embodiment of the present application, the position fixation between the cover and the insulating head is achieved by connecting the end cover and the conductive needle.

[0014] Furthermore, in an X-ray tube cooling device in the present application, the flow guide comprises a main body and a liquid inlet pipe and a liquid outlet pipe connected to the main body, the flow guide flow channel is arranged in the main body, the liquid inlet pipe and the liquid outlet pipe, the first liquid inlet port and the flow guide outlet port are arranged on the liquid inlet pipe and the liquid outlet pipe respectively; the flow guide also comprises a connecting pipe connected between the main body and the flow channel port; A main liquid outlet is arranged on the tube shell, and a liquid outlet pipe is communicated with the main liquid outlet and the liquid outlet pipe and the main liquid outlet are sealedly connected.

[0015] As a preferred solution of the present application, the deflector is connected to the cover via a connecting pipe to fix its position.

[0016] It can be seen from the above technical solution that the present invention has the following beneficial effects: The present invention provides an X-ray tube cooling device, the principle of which is that the coolant enters the chamber from the main liquid inlet, then enters the diversion flow channel through the diversion liquid inlet, and finally is discharged from the diversion liquid outlet. Since the main liquid inlet is arranged on the side of the chamber corresponding to the anode assembly, and the diversion liquid inlet is adjacent to the tube shell on the side of the corresponding cathode assembly, the coolant can flow from the anode assembly side to the cathode assembly side in the chamber as a whole, that is, flow in the x-axis direction, adapting to the characteristic that the heat generated by the anode of the X-ray tube is greater than that of the cathode to achieve the cooling effect on the X-ray tube, and since the diversion liquid inlet is adjacent to the tube shell on the side of the corresponding cathode assembly, the heat generated by the cathode assembly can be effectively taken away in this process. Thereby, the cooling efficiency of the X-ray tube is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of an X-ray tube cooling device in an embodiment of the present application; Figure 2 A schematic diagram of a flow guide and an X-ray tube in an embodiment of the present application; Figure 3 for Figure 2 A partial enlarged view of the area A in the middle circle; Figure 4 Schematic diagram of the deflector in the embodiment of the present application.

[0018] In the figure: 1-X-ray tube; 11-tube shell; 111-annular cover; 112-anode mounting shell; 113-cathode mounting shell; 1131-insulating head; 11310-cooling chamber; 1132-cathode shell; 12-anode assembly; 121-anode target plate; 13-cathode assembly; 131-conductive needle; 2-tube sleeve; 20-chamber; 201-anode chamber; 202-cathode chamber; 21-main liquid inlet; 22-main liquid outlet; 30-diversion channel; 301-first liquid inlet; 302-diversion liquid outlet; 31-main body; 32-liquid inlet pipe; 33-liquid outlet pipe; 34-connecting pipe; 4-sealing cap; 40-second liquid inlet; 41-liquid inlet channel; 411-inner extension channel; 412-outer extension channel; 42-tube body; 43-extension sleeve; 431-annular wall; 432-annular top; 44-end cover. DETAILED DESCRIPTION

[0019] Combination Figures 1 to 4 An X-ray tube cooling device is shown, comprising: An X-ray tube 1, the X-ray tube 1 comprises a tube shell 11, an anode assembly 12 and a cathode assembly 13 are arranged in the tube shell 11, the anode assembly 12 comprises an anode target plate rotating around the x-axis, and the anode assembly 12 and the cathode assembly 13 are spaced apart in the axial direction of the x-axis; A tube sleeve 2 is arranged outside the tube shell 11, and a coolant flows in a chamber 20 between the tube sleeve 2 and the tube shell 11; The tube sleeve 2 is provided with a main liquid inlet 21, which is arranged on a side of the chamber 20 corresponding to the anode assembly 12; The guide is arranged in the chamber 20, and the guide includes a guide channel 30, and the guide channel 30 is provided with a guide liquid inlet and a guide liquid outlet 302. The guide liquid inlet is adjacent to the tube shell 11 on one side of the corresponding cathode assembly 13, and the guide liquid outlet 302 is used to discharge the coolant in the chamber 20.

[0020] Based on the above structure, an X-ray tube cooling device is provided, the principle of which is that the coolant enters the chamber 20 from the main liquid inlet 21, then enters the diversion flow channel 30 through the diversion liquid inlet, and finally is discharged from the diversion liquid outlet 302. Since the main liquid inlet 21 is arranged on the side of the chamber 20 corresponding to the anode assembly 12, and the diversion liquid inlet is adjacent to the tube shell 11 on the side corresponding to the cathode assembly 13, the coolant can flow from the anode assembly 12 to the cathode assembly 13 in the chamber 20 as a whole, that is, it flows in the x-axis direction, adapting to the characteristic that the heat generated by the anode of the X-ray tube is greater than that of the cathode to achieve the cooling effect on the X-ray tube, and since the diversion liquid inlet is adjacent to the tube shell 11 on the side corresponding to the cathode assembly 13, in this process, the heat generated by the cathode assembly 13 can be effectively taken away. Thereby improving the cooling efficiency of the X-ray tube. In this embodiment, the coolant is an electrical insulating oil that is resistant to high pressure and high temperature. The cooler flowing out of the diversion liquid outlet 302 is transported to the external heat exchanger for cooling and then circulated and pumped to the main liquid inlet 21.

[0021] In this embodiment, the tube shell 11 includes an annular cover 111 and an anode mounting shell 112 and a cathode mounting shell 113 arranged on both axial sides of the annular cover 111, the anode assembly 12 is installed in the anode mounting shell 112, and the cathode assembly 13 is installed in the cathode mounting shell 113. The anode assembly 12 includes an anode target plate 121, and the anode target plate 121 is arranged in the annular cover 111; the chamber 20 includes an anode chamber 201 and a cathode chamber 202, and the anode chamber 201 and the cathode chamber 202 correspond to the spaces of the chamber 20 located at both ends of the annular cover 111 in the x-axis direction, respectively, and the anode mounting shell 112 and the cathode mounting shell 113 are respectively arranged in the anode chamber 201 and the cathode chamber 202; the main liquid inlet 21 is arranged in the anode chamber 201, and the diversion liquid inlet is arranged in the cathode chamber 202.

[0022] In this embodiment, the cathode mounting shell 113 includes an insulating head 1131 and a cathode shell 1132, the cathode shell 1132 is connected to the annular cover 111, the insulating head 1131 is connected to the end of the cathode shell 1132 away from the annular cover 111, the diversion liquid inlet includes a first liquid inlet 301 adjacent to the cathode shell 1132, and the inner surface of the cathode shell 1132 is attached with a heat-absorbing coating with an absorption rate greater than 0.8, and the material of the heat-absorbing coating can be chromium oxide or iron oxide to further improve the heat dissipation efficiency. In addition, a cooling cavity 11310 is provided on the insulating head 1131, and the cooling cavity 11310 is connected to the diversion flow channel 30. The diversion liquid inlet includes a second liquid inlet 40, and the second liquid inlet 40 is arranged between the cooling cavity 11310 and the diversion flow channel 30. Thereby, sufficient cooling of the insulating head 1131 is achieved to further improve the heat dissipation efficiency on the cathode side.

[0023] Combination Figures 2 to 4 As shown, specifically, the cooling cavity 11310 is provided with an opening at one end away from the annular cover 111; The flow guide also includes a cover 4, which is disposed on the open end of the cooling cavity 11310, and the second liquid inlet 40 is disposed on the cover 4. Based on the above structure, the cooling cavity 11310 is disposed between the separately connected insulating head 1131 and the cover 4, which has the advantage of simple processing and manufacturing.

[0024] In this embodiment, the cooling cavity 11310 is provided with a liquid inlet channel 41, which is arranged between the cover 4 and the insulating head 1131. The liquid inlet channel 41 and the channel opening 40 form convection, which can improve the fluidity of the coolant in the cooling cavity 11310 to improve the cooling efficiency.

[0025] Further, combined with Figure 3 As shown, in this embodiment, the cover 4 includes an annular member, the annular member includes a tube body 42, the tube body 42 axially extends into the cooling cavity 11310, a gap is provided between the front end of the tube body 42 in the extension direction and the bottom of the cooling cavity 11310, the liquid inlet channel 41 includes an inner extension channel 411, the inner extension channel 411 is arranged between the inner side wall of the cooling cavity 11310 and the radial direction of the tube body 42; the channel opening 40 is arranged on the inner side of the tube cavity of the tube body 42, and the channel opening 40 is arranged at one end of the tube body 42 away from the bottom of the cooling cavity 11310. The inner extension channel 411 can ensure that the coolant entering the cooling cavity 11310 is in full contact with the inner wall of the insulating head 1131, so as to further improve the heat exchange efficiency.

[0026] In this embodiment, the annular member further includes an extension sleeve 43, which is arranged at one end of the tube body 42 away from the bottom of the cooling cavity 11310, and the extension sleeve 43 includes an annular wall 431, which is arranged on the radially outer side of the tube body 42, and the extension sleeve 43 also includes an annular top 432 connected between the annular wall 431 and the tube body 42 in the radial direction. The end of the insulating head 1131 is arranged in the annular cavity between the extension sleeve 43 and the tube body 42, and the liquid inlet channel 41 includes an outer extension channel 412 arranged between the extension sleeve 43 and the side wall of the insulating head 1131, and the outer extension channel 412 connects the inner extension channel 411 and the chamber 20. The coolant passes through the outer extension channel 412, the inner extension channel 411, the inner cavity of the tube body 42, and the channel port 40 to fully take away the heat of the insulating head 1131.

[0027] In this embodiment, the cover 4 further includes an end cover 44, which is disposed on the open end of the annular member away from the bottom of the cooling chamber 11310, the end cover 44 is sealedly connected to the annular member, and the flow channel opening 40 is disposed on the end cover 44. Specifically, the end cover 44 is connected to the annular member by welding or fasteners.

[0028] In this embodiment, a conductive needle 131 is fixed on the insulating head 1131, and the conductive needle 131 is axially inserted into the insulating head 1131 and the end cover 44. The end cover 44 is fixed on the conductive needle 131, and the conductive needle 131 and the end cover 44 are sealed. The position fixation between the cover 4 and the insulating head 1131 is achieved by connecting the end cover 44 and the conductive needle 131. Specifically, the end cover 44 is provided with a through hole that is interference-fitted with the conductive needle 131, and the conductive needle 131 has sufficient rigidity to support the end cover 44. The material of the conductive needle 131 is an iron-nickel alloy.

[0029] In this embodiment, the flow guide includes a main body 31 and a liquid inlet pipe 32 and a liquid outlet pipe 33 connected to the main body 31. The diversion flow channel 30 is arranged in the main body 31, the liquid inlet pipe 32 and the liquid outlet pipe 33. The first liquid inlet port 301 and the diversion liquid outlet port 302 are respectively arranged on the liquid inlet pipe 32 and the liquid outlet pipe 33; the flow guide also includes a connecting pipe 34 connected between the main body 31 and the flow channel port 40; The tube shell 11 is provided with a main liquid outlet 22, and the liquid outlet pipe 33 is connected to the main liquid outlet 22 and the liquid outlet pipe 33 and the main liquid outlet 22 are sealed. In this embodiment, the material of the flow guide is metal. The flow guide is connected to the cover 4 through a connecting pipe 34 to achieve position fixation.

[0030] The technical principles of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without creative work, and these methods will fall within the scope of protection of the present invention.

Claims

1. An X-ray tube cooling device, comprising: An X-ray tube (1), the X-ray tube (1) comprising a tube shell (11), an anode assembly (12) and a cathode assembly (13) being arranged in the tube shell (11), the anode assembly (12) comprising an anode target disk rotating about an x-axis, the anode assembly (12) and the cathode assembly (13) being arranged at intervals in the axial direction of the x-axis; A pipe sleeve (2) is arranged outside the pipe shell (11), and a coolant flows in a chamber (20) between the pipe sleeve (2) and the pipe shell (11); Features: The tube sleeve (2) is provided with a main liquid inlet (21), and the main liquid inlet (21) is arranged on a side of the chamber (20) corresponding to the anode assembly (12); A flow guide, the flow guide is arranged in the chamber (20), the flow guide comprises a flow guide channel (30), the flow guide channel (30) is provided with a flow guide liquid inlet and a flow guide liquid outlet (302), the flow guide liquid inlet is adjacent to the tube shell (11) on one side of the corresponding cathode assembly (13), and the flow guide liquid outlet (302) is used to discharge the coolant in the chamber (20).

2. An X-ray tube cooling device according to claim 1, characterized in that: The tube shell (11) comprises an annular cover (111) and an anode mounting shell (112) and a cathode mounting shell (113) arranged on both axial sides of the annular cover (111); the anode assembly (12) is installed in the anode mounting shell (112); the cathode assembly (13) is installed in the cathode mounting shell (113); the anode assembly (12) comprises an anode target disk (121); and the anode target disk (121) is arranged in the annular cover (111); the chamber (20) comprises An anode chamber (201) and a cathode chamber (202), the anode chamber (201) and the cathode chamber (202) respectively correspond to the chamber (20) and are located in the spaces at both ends of the annular cover (111) in the x-axis direction, the anode mounting shell (112) and the cathode mounting shell (113) are respectively arranged in the anode chamber (201) and the cathode chamber (202); the main liquid inlet (21) is arranged in the anode chamber (201), and the diversion liquid inlet is arranged in the cathode chamber (202).

3. An X-ray tube cooling device according to claim 2, characterized in that: The cathode mounting shell (113) comprises an insulating head (1131) and a cathode shell (1132); the cathode shell (1132) is connected to the annular cover (111); and the insulating head (1131) is connected to an end of the cathode shell (1132) away from the annular cover (111); The diversion liquid inlet comprises a first liquid inlet (301) adjacent to the cathode shell (1132), and a heat-absorbing coating is attached to the inner surface of the cathode shell (1132); The insulating head (1131) is provided with a cooling cavity (11310), the cooling cavity (11310) is in communication with the diversion channel (30), the diversion liquid inlet comprises a second liquid inlet (40), and the second liquid inlet (40) is arranged between the cooling cavity (11310) and the diversion channel (30).

4. An X-ray tube cooling device according to claim 3, characterized in that: The cooling cavity (11310) is provided with an opening at one end away from the annular cover (111); The flow guide also includes a cover (4), the cover (4) being arranged to cover the open end of the cooling cavity (11310), and the second liquid inlet (40) being arranged on the cover (4).

5. An X-ray tube cooling device according to claim 4, characterized in that: The cooling cavity (11310) is provided with a liquid inlet channel (41), and the liquid inlet channel (41) is arranged between the sealing cover (4) and the insulating head (1131).

6. An X-ray tube cooling device according to claim 5, characterized in that: The cover (4) comprises an annular member, the annular member comprises a tube body (42), the tube body (42) extends axially into the cooling cavity (11310), a gap is provided between the front end of the tube body (42) in the extension direction and the bottom of the cooling cavity (11310), the liquid inlet channel (41) comprises an inner extension channel (411), the inner extension channel (411) is arranged between the inner side wall of the cooling cavity (11310) and the radial direction of the tube body (42); the second liquid inlet (40) is arranged on the inner side of the tube cavity of the tube body (42), and the second liquid inlet (40) is arranged at an end of the tube body (42) away from the bottom of the cooling cavity (11310).

7. An X-ray tube cooling device according to claim 6, characterized in that: The annular member further comprises an extension sleeve (43), the extension sleeve (43) being arranged at an end of the tube body (42) away from the bottom of the cooling cavity (11310), the extension sleeve (43) comprising an annular wall (431), the annular wall (431) being arranged radially outside the tube body (42), the extension sleeve (43) further comprising an annular top (432) connected between the annular wall (431) and the tube body (42) in a radial direction, the end of the insulating head (1131) being arranged in an annular cavity between the extension sleeve (43) and the tube body (42), the liquid inlet channel (41) comprising an outer extension channel (412) arranged between the extension sleeve (43) and the side wall of the insulating head (1131), the outer extension channel (412) being connected to the inner extension channel (411) and the chamber (20).

8. An X-ray tube cooling device according to claim 7, characterized in that: The sealing cover (4) further comprises an end cover (44), wherein the end cover (44) is arranged to cover an open end of the annular member away from the bottom of the cooling chamber (11310), the end cover (44) and the annular member are sealedly connected, and the second liquid inlet (40) is arranged on the end cover (44).

9. An X-ray tube cooling device according to claim 8, characterized in that: A conductive needle (131) is fixed on the insulating head (1131), the conductive needle (131) is axially inserted through the insulating head (1131) and the end cover (44), the end cover (44) is fixed on the conductive needle (131), and the conductive needle (131) and the end cover (44) are sealed and connected.

10. An X-ray tube cooling device according to any one of claims 3 to 9, characterized in that: The flow guide comprises a main body (31), and a liquid inlet pipe (32) and a liquid outlet pipe (33) connected to the main body (31); the flow guide channel (30) is arranged in the main body (31), the liquid inlet pipe (32) and the liquid outlet pipe (33); the first liquid inlet port (301) and the flow guide outlet port (302) are arranged on the liquid inlet pipe (32) and the liquid outlet pipe (33), respectively; the flow guide further comprises a connecting pipe (34) connected between the main body (31) and the second liquid inlet port (40); The tube shell (11) is provided with a main liquid outlet (22), and the liquid outlet pipe (33) is connected to the main liquid outlet (22), and the liquid outlet pipe (33) and the main liquid outlet (22) are sealed.

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